Supply and demand as well as more state regulations here compared to CA is why there is a major price discrepancy. However don't be fooled lots of people in the industry in CA are having major issues going on as well because of non existent regulations (same happened in Oregon and Washington) and overwhelming supply.

You cannot really compare California to other legal states as well due to higher crime rates associated with cartel influx of cannabis and money laundering happening there exploiting others and pushing out legitimate businesses.